diff --git a/2024/day-12/solution-1.sh b/2024/day-12/solution-1.sh
index a01faa1..f1c3a97 100644
--- a/2024/day-12/solution-1.sh
+++ b/2024/day-12/solution-1.sh
@@ -5,6 +5,7 @@ FILE=test-input-2
 read -r -a MAP_ARRAY <<< "$( < "$FILE" paste -s -d "" | sed -E 's/(.)/\1\ /g' )"
 MAP_LEN=${#MAP_ARRAY[@]}
 MAP_WIDTH=$(( $( head -1 "$FILE" | wc -c ) -1 ))
+MAP_WIDTH_INV=$(( 0 - MAP_WIDTH ))
 MAP_HEIGHT=$( < "$FILE" wc -l )
 printf "Len: %s Width: %s Height: %s\n" "$MAP_LEN" "$MAP_WIDTH" "$MAP_HEIGHT"
 
@@ -19,14 +20,12 @@ check_adjacent () {
 
   DIFF=$(( $2 - $1 ))
   # Valid adjacent distances
-  case "$DIFF" in
-    1|-1|"${MAP_WIDTH}"|-"${MAP_WIDTH}")
-      :
-      ;;
-    *)
-      return 1
-      ;;
-  esac
+  if [[ $DIFF -eq 1 ]] || [[ $DIFF -eq -1 ]] || [[ $DIFF -eq $MAP_WIDTH ]] || [[ $DIFF -eq $MAP_WIDTH_INV ]]
+  then
+    :
+  else
+    return 1
+  fi
 
   # Check for left/right bounds
   if [[ $DIFF -eq 1 ]] && [[ $(( $2 % MAP_WIDTH )) -eq 0 ]]